Fetal circulation right before birth | Circulatory system physiology | NCLEX-RN | Khan Academy
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- Опубликовано: 12 дек 2012
- Watch how the blood flows through the fetal circulation and compare it to what happens in the baby's body. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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The smile shows that there are two umbilical arteries and one umbilical vein. Two eyes-arteries, smile-vein. Great video!
Genius! Thank you! :D
Or AVA. 2 arteries, 1 vein
Ofcource
You must be a doctor now😅🔥
I'm really glad that you have found this video useful. I'm going to keep making these, so keep watching and share with your friends. =)
You´re doing a great job, I really appreciate your videos! However I have to point out one big MISTAKE in this video with the blood mixing. I checked out some anatomy and physiology books and this is how it works:
So as you said from umbilical vein one part of the blood goes to liver and the other part goes through ductus venosus straight to Inferior Vena Cava (IVC). Here the oxygenated blood from umbilical vein mixes with deoxygenated blood in IVC and in the result the blood is now 67% oxygenated.
Now we get to the important part. IVC a SVC (superior vena cava) meet in the right atrium. However the blood does NOT mix in the right atrium (or it does just a little bit) and this is because of the laminar flow of blood (both in IVC and SVC). So from IVC the blood (67% oxygenated) goes through foramen ovale straight to left atrium and eventually to left ventricle and aorta ...and from SVC the blood (deoxygenated) goes to right ventricle, than to pulmonary artery and eventually most of it goes through ductus arteriosus to DESCENDING part of aorta, where it mixes with the 67% oxygenated blood creating 60% oxygenated blood
But why is this so important? Brain requires greater amount of oxygen for proper development. And the arteries supplying brain and upper limbs come out of aortic arch before the 67% oxygenated blood (from IVC) mixes in descending part of aorta with deoxygenated blood (from SVC) making the 60% oxygenated blood which goes to lower limbs.
I have tried my best to explain it, but if anyone didn´t understand and is interested in this please leave a comment
This is correct. The most oxygenated blood flows preferentially from IVC across the RA via FO to LA and onwards to the brain. less oxygenated blood from SVC flows preferentially to RV -> PA -> DA -> Aorta (beyond the right brachiocephalic artery and left common carotid supply to the brain) and then either to lower limbs or back to the placenta.
Great remark Emil Havranek, just becareful because you said ..."from SVC the blood (deoxygenated) goes to right ventricle, than to pulmonary artery and eventually most of it goes through ductus venosus to DESCENDING part of aorta, where it mixes" but it's ductus arteriosus, not venosus! I'm sure you just had a little slip! I just wanted to point it out for anyone else reading your otherwise very clear explanation :)
xx9aznfaith9xx Thank you! You´re right, I´ve corrected it and now it should be OK :)
Emil Havranek thank you .... you are amazing
+Emil Havranek thank you, you're amazing!!
Dude you kick any professor's ass anytime!!
This is the best explanation I have ever heard! In Anatomy, we never even discussed the fact about pressure and oxygen! Well done!
A very warm Thank you from a very overwhelmed first year medical student here
Dude YOU ARE the maaaaan!!!!!! Thank you!!!!
I was few days to my nclex exam but couldn’t study anything because of my busy schedule but thank God I linked up with Mr Riq God bless you more cuz you made it possible for me to pass at once even without preparation
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@Eliana Masih Am sorry for what some people are passing through, I also passed through the difficulties just be patient and keep studying
@Eliana Masih Try to get yourself good help , for me I didn’t study a bit , mr riq worked for me 💯
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Thank you for breaking this material down into simple, understandable pieces. Always in awe of how amazing everything works in A&P!
I dont even pay attention in Anatomy class anymore. I just come home and watch one of his videos, and I get nothing but 100% on my test. He just makes everything so understandable. Thanks Kahn.
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Hats off Rishi...U rock...
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I'm a vet, it's amazing how simple yet clever mammals truly work are. Well done with this it's amazing.
AMAZING EXPLANATION!!! Thank you!!!!
Absolutely brilliant! Thanks for making fetal circulation student-friendly :)
Im doing first year medicine and GOD bless you, you are better than all of my lectures you should have universities and colleges begging you to teach for them :(
Mohamed Bellahcene you are living the dream! study hard :)
How's med school coming? I'm a Vet, it's so hard not to watch these vidios
Mohamed Bellahcene lol I have to learn this as well but for high school biology.
Did you graduate? 🔥
Thank you so much, currently studying for the MCAT. This helped A LOT!!
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너무 도움이 됐어요! :) thank you so much
OMG LOVE YOUR EXPLAINATION! My lecturer's only mentioned briefly and expect us to know most of the stuff. Thank goodness I found this before my finals. :P
this is the best explanatory video I've ever watch about the subject. Thank you.
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teacher explained this twice and it took an hour... confused the heck out of everyone.... you do it in 12 minutes.... and aha!!....Got it! Thanks!
Tania Kirchner its now teachers fault when you are not giving the lecture proper attention??
Students can learn in different ways, maybe it's easier for students to learn visually with drawings and audio that makes sense with someone who takes the time to really explain.
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Very helpful in my review for the MCAT. Thanks!
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Phenomenal explanation of the fetal circulation, he makes it easy to understand and grasp. Thanks for the awesome video.
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i always found teh fetal circulations in parts, this is the BEST explanation . thank you so much
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